Denial of Service in FreeRDP Due to Dimension Validation Flaw
CVE-2026-91955

8.2HIGH

Key Information:

Vendor

Freerdp

Status
Freerdp
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91955?

FreeRDP, prior to version 3.31.0, exhibits a vulnerability where it inadequately verifies client-supplied DesktopWidth and DesktopHeight values during the GCC negotiation process. This oversight permits remote attackers to send specially crafted RDP packets that either contain zero or excessively large dimensions. Such packets can trigger division-by-zero errors or assertion failures in the multifragment update capability calculations, leading to unexpected termination of the server process. To mitigate this risk, users are urged to upgrade to the latest version of FreeRDP.

Affected Version(s)

FreeRDP 0 < 3.31.0

FreeRDP 3.31.0

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/freerdp-before-3.31....
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.